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Upgrading Zimbra 6 to 7?

We intend to upgrade our Zimbra 6 to 7.2 next week. On the official NE download, the build number indicated is 2020 (zcs-NETWORK-7.2.0_GA_2669.UBUNTU8_64.20120410002020). However, in the email for critical update, the build number indicated is 2153 (zcs-NETWORK-7.2.0_GA_2669.RHEL4.20120410002153.tgz).

In this case, the critical update is newer than the official update made available online. The question is, can I upgrade version 6 to 7 using the critical update? Or must I upgrade with the official NE download and patch with the critical update?